CONTENTSIntroduction................... 3List of localities................. 4Systematics................... 5Chaetogaster.................. 5Allonais................... 7Slavina................... 8Haemonais .................. 9Stephensoniana.................. 11Nais.................... 12Pristina................... 13Dero (Dero).................. 20Dero (Aulophorus)................ 25Conclusions................... 32Key to the Naididae of Surinam............. 34Literature cited.................. 35INTRODUCTIONNeotropical oligochaetes have been the object of study of several investigators over the last century, but these have resulted, for the most part, in reports of small collections or of limited geography. More exhaustive studies such as the one on Brazil by Marcus (1943) have been few. It is hoped that the knowledge of the fauna of another South American country, Surinam, will add materially to an overview of neotropical Naididae and will stimulate additional studies in other areas of the continent.Through the courtesy of the Rijksmuseum van Natuurlijke Historie,